[cvsv]

The 2 or 1 lanes are separated by a metal fence. You can only overtake at the stretches of road where your direction have 2 lanes on one side of the fence.

They did feel a bit terrifying and constrained when we first got them. But now we're used to it.

I did nearly have an accident once when I tried to overtake a truck too close to the road switching from 1+2 to 2+1. Though that was due to me being really really stupid.